Car pillars are quite similar to the pillar of your house. Like pillars provide strength to the overall building, car pillars' primary function is to offer support and strength to the vehicle. The pillars come in various types and are clearly visible on the car's body. 

Read further to gain valuable insight into car pillars, their different types, and their specific purposes.

Car pillars are fundamental components of a car’s structure. They provide essential support for the roof and windows area and are positioned in a vertical or slightly inclined position. 

These pillars play a crucial role in providing a strong foundation for the car roof. They help hold the car’s windscreens and the rear and side windows intact even when additional weight of roof racks is added. Sometimes, vehicle designers address car pillars as posts.

There are multiple pillars your car can have, namely A Pillar, B Pillar, C Pillar, and D Pillar. These pillars are positioned from the front to the rear of the car contributing to the overall safety of the vehicle and the passengers inside. 

It is important to note here that not all cars will have the same number of pillars. For instance, most Sedans have three pillars (A, B, C), while giant cars like SUVs have all 4 pillars. (A, B, C, D)

The name of the A, B, C and D pillars appears to be derived from the shape they resemble when seen from the sides. For instance, the A pillar takes the form of the English alphabet ‘A’ and the B, C, and D letters, respectively. 

When vehicles have elongated structures, there can be multiple B pillars in certain cases. (B1, B2, and so on) This naming pattern holds great significance both for aesthetic and practical purposes. It facilitates easy communication and easier identification of the vital parts for the customer.

What are the Purposes of the A Car Pillar?

• The a-Pillar is the foremost pillar of the car that holds the windshield. 
• Normally made of steel alloys, the purpose of A pillar is to hold the hinges of your front doors as well. 
• It plays a crucial role in the car's safety by firmly holding the window glass. This prevents it from collapsing during accidents or collisions.

What are the Purposes of the B Car Pillar?

• Also referred to as centre pillars, they are located between your car's front and rear doors.
• B Pillar adds structural rigidity to your car by connecting the roof to the vehicle’s floor.
• It supports the side windows and ensures that the rear door's latches are intact, thus ensuring passenger safety.

What are the Purposes of the C Car Pillar?

• C Pillar is the rearmost pillar in most cars, including Sedans. 
• They support the rear portion of the roof, ensuring that it remains stable during all kinds of driving situations.
• Just like B Pillars, the C Pillar contributes to the car's safety to withstand side impacts.

What are the Purposes of the D Car Pillar?

Not all cars feature D Pillars. It is found in vehicles like SUVs, which have three seating rows. So, in these cases, D Pillars are the rearmost pillars.

The pillar provides structural support to the body. Hence, it is recommended that any repairs to the pillar of the car must be approached with extreme caution.

• Only skilled mechanics should carry out modifications required in car pillars.
• In severe damage, replacing the entire body shell rather than repairing the car roof is advisable. Attempting to repair the roof in such instances might compromise the vehicle's safety. 
• Only specialised tools should be used to perform structural repairs on the vehicle body.

Thus, car pillars are designed in a way to eliminate blind spots in car windows. This, in turn, enhances the car's structural integrity, significantly contributing to improved safety while driving on the road.